A card can be included in a Commander deck only if every color in its color identity is also found in the color identity of the deck’s commander.
January 25, 2019 · Ravnica Allegiance
A card can be included in a Commander deck only if every color in its color identity is also found in the color identity of the deck's commander.
February 1, 2014 · Born of the Gods
A card can be included in a Commander deck only if every color in its color identity is also found in the color identity of the deck’s commander.
September 30, 2011 · Innistrad
A card can be included in a Commander deck only if every color in its color identity is also found in the color identity of the deck's commander.
June 17, 2011 · Commander 2011
A card can’t be included in a Commander deck if it is any color, as defined by its mana cost
April 1, 2011 · Duel Decks: Knights vs. Dragons
A card can't be included in a Commander deck if it has any colors that aren't part of the commander's color identity or if it has any mana symbols in its mana cost or rules text that aren't of a color in the commander's color identity.
February 4, 2011 · Mirrodin Besieged
A card can’t be included in a Commander deck if it has any colors that aren’t part of the commander’s color identity or if it has any mana symbols in its mana cost or rules text that aren’t of a color in the commander’s color identity.